Lock washer



FIG. 1 is a top perspective view of a lock washer, showing my newdesign;

FIG. 2 is a top-plan view thereof;

FIG. 3 is a side-elevational view thereof;

FIG. 4 is a bottom-plan view thereof; and

FIG. 5 is a reduced bottom perspective view thereof.

The ornamental design for a lock washer, as shown.